CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Junwei Zhang,Hui Lin,Wenhui Lou,Ruijin Hong,Zhaoxia Han,Dawei Zhang
Photo-stimulated luminescence materials have shown significant potential in the field of information storage, but they still face critical challenges in the regulation of trap levels. Herein, Ba 0.75 Al 11 O 17.25 :Eu 2+ fluorescent ceramics with abundant deep traps (1.24 eV) were reported via selective Mn 2+ co-doping. This material exhibits a homogeneous and dense crystalline structure, and its narrow-band emission at 514 nm is attributed to the energy transfer of Eu-Mn. Thermoluminescence curves, X-ray photoelectron spectroscopy and electron paramagnetic resonance spectra confirm that the trap levels primarily arise from oxygen vacancies and Reidinger defects, and Mn 2+ doping suppresses the formation of shallow traps through charge compensation mechanism. Significantly, information writing and reading in the ceramic medium were achieve using 254 nm UV light and 980 nm NIR light or thermal stimulation. The excellent photo-stimulated luminescence properties and high read-write stability of Ba 0.75 Al 11 O 17.25 :Eu 2+ , Mn 2+ are expected to accelerate the development of the next generation of optical storage technology.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2017
·Vol. 8
·期 1
·4
·
IF 1.566
Xianli Li,Yan Guo,Binbin Luo
Organic–inorganic CH3NH3PbCl3perovskite nanocrystals (PNCs) doped with Mn2+, CH3NH3PbxMn1−xCl3, have been successfully prepared using a reprecipitation method at room temperature. Structural and morphological characterizations reveal that the CH3NH3PbxMn1−xCl3PNCs with cubic phase transforms from particles to cubes and increases in size from 16.2 ± 4.4 nm in average diameter to 25.3 ± 7.2 nm in cubic length after the addition of Mn2+precursor. The CH3NH3PbxMn1−xCl3PNCs exhibit a weak exciton emission at ~405 nm with a low absolute quantum yield (QY) of around 0.4%, but a strong Mn2+dopant emission at ~610 nm with a high QY of around 15.2%, resulting from efficient energy transfer from the PNC host to the Mn2+dopant via the4T1→6A1transition. In addition, the thermal and air stability of CH3NH3PbxMn1−xCl3PNCs are improved due to the passivation with (3-aminopropyl) triethoxysilane (APTES), which is important for applications such as light emitting diodes (LEDs).Keywords:perovskite;Mn2+doping;CH3H3PbCl3;stability
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5113-5123
·
IF 6.569
Runtian Kang,Hang Chen,Ruijie Ji,Haoyang Wang,Takatoshi Seto,Yuhua Wang
It is of great significance for white light-emitting diodes (wLEDs) to explore new, efficient and stable inorganic phosphors excited by wideband near-ultraviolet (n-UV) light. A new type of efficient emission-tunable Ce3+/Mn2+ doped Ca2YHf2Al3O12 (CYHAO) garnet phosphor which can be excited by n-UV light is studied in this work. Due to the effective energy transfer (ET) from Ce3+ to Mn2+ in CYHAO, CYHAO:0.09Ce3+,xMn2+ phosphors have a wide excitation band in the 370–470 nm region with a peak at 410 nm. Under excitation at 410 nm, all the samples show tunable color emission and match with the near UV chip. Through the decay time, it is determined that the energy transfer efficiency is as high as 88.83%. The calculated activation energy is about 0.217 eV, indicating the relatively good thermal stability. The cathodoluminescence (CL) properties show that the phosphor has a high saturation current and saturation voltage. A single component white LED is fabricated by using the CYHAO:0.09Ce3+,0.3Mn2+ phosphor and a 400 nm n-UV chip. It is worth noting that the detailed study of the energy transfer mechanism, thermal quenching mechanism and CL mechanism has reference value for the development of new co-doped phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Liang Shi,Xueying Wang,Rui Peng,Yongcheng Lu,Cheng Liu,Dainan Zhang,Huaiwu Zhang
A series of Mn 2+ -doped Mg 1-x Mn x Ta 2 O 6 (x = 0.02, 0.04, 0.06, 0.08, 0.10, 0.12) ceramics were synthesized by solid-state reaction method. The influence of introducing Mn–O bonds as a partial replacement for Mg–O bonds on the lattice and microwave dielectric properties was systematically investigated. XRD and Rietveld refinement confirm that Mn 2+ occupies the 2a Wyckoff position and forms a pure trirutile phase. Moreover, based on the chemical bond theory, the dielectric constant is mainly affected by the ionicity of the Ta–O bond. The lattice and dielectric properties remain relatively stable with Mn 2+ doping below 0.1, but excessive Mn 2+ doping leads to pronounced distortion of the lattice, which is not beneficial for lattice stability and microwave dielectric properties. Introducing an appropriate amount of Mn–O bonds with high bond dissociation energy facilitates MgO6 octahedron stability, which improves the thermal stability of the lattice. Accordingly, the microwave dielectric properties for 0.06 Mn 2+ -doped MgTa 2 O 6 ceramics were determined: ε r = 28, Q × f = 105,000 GHz (at 7.5 GHz), τ f = 19.5 ppm/ ° C.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2018
·
IF 2.32
Rui Wang,Maohui Yuan,Chaofan Zhang,Hongyan Wang,Xiaojun Xu
Transition metal ions (e.g. Mn 2+ ) and lanthanide co-doped upconversion (UC) materials have attracted wide attention in recent years due to their promising application in multicolor display. Here, we report the hydrothermal synthesis and characterization of Mn 2+ doped monodisperse CaF 2 :Yb 3+ /Ho 3+ microspheres . The results of X-ray diffraction (XRD) revealed that Mn 2+ doping does not change the cubic phase of CaF 2 material but will lead to diffraction peaks shifting slightly towards higher angle due to the substitution of larger Ca 2+ by the relatively smaller Mn 2+ . Under the excitation of 980 nm continuous wave (CW) laser, these microspheres exhibit green-yellow-red tuning colors and remarkable enhancement of both red to green ratio (R/G) and red to blue ratio (R/B) when increasing Mn 2+ concentration from 0 to 30 mol%. The energy migration process between Ho 3+ and Mn 2+ was proposed and supported by time-decay and power dependence measurements of Ho 3+ UC emission. These upconversion materials may have potential applications in optical devices , color display, nanoscale lasers and biomedical imaging.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-9
·
IF 3.8
Liu Yongtao,Duan Bin,Zhou Lin,Wu Yuxiang,Wang Fengyi,Ding Changchun,Hu Junshan
Here, this study reports single-band red upconversion emission in β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ phosphor by doping Mn 2+ . The optimum concentration of Mn 2+ ions in β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ phosphor was 0.20. The intensity of red and green emissions is increased by 27.4 and 19.3 times, respectively. Compared with the samples without Mn 2+ ions, the red-green integral strength ratio of β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ /Mn 2+ sample was significantly increased by 28.4 times, reaching 110.9. The UCL mechanism was explored by analyzing the down-conversion luminescence spectra, absorption spectra, UCL spectra, and upconversion fluorescence lifetime decay curves of Yb 3+ /Er 3+ /Mn 2+ co-doped β-Ba 2 ScAlO 5 . The enhancement of upconversion red light is achieved through energy transfer between defect bands and Er 3+ ions, as well as energy transfer between Mn 2+ ions and Er 3+ ions. In addition, the Mn 2+ doped β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ red UCL phosphors have great potential for ambient temperature sensing in the 298–523 K temperature range. The maximum sensitivity of β-Ba 2 ScAlO 5 : Yb 3+ /Er 3+ /Mn 2+ phosphor as a temperature sensor at 523 K is 0.0247 K −1 .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2018
·Vol. 30
·期 7
·075704
·
IF 3.404
Weiwei Chen,Xiaosheng Tang,Zhigang Zang,Yue Shi,Zhaoqi Yang,Juan Du
Doping of Mn2+ into semiconductor nanocrystals has been demonstrated to endow them with novel electronic, optical and magnetic functionalities. In this paper, Mn-doped CsPbX3 (X = Br, Cl) quantum dots (QDs) were synthesized at room temperature via a facile strategy by introducing dimethyl sulfoxide (DMSO)-MnBr2/PbX2 composite as a precursor. The excitonic emission spectra of the as-obtained Mn-doped CsPbX3 QDs can be tuned from 517 nm to 418 nm by adjusting the ratio of PbBr2/PbCl2 precisely, and the luminescence mechanism of the doped QDs is discussed in detail. Moreover, the highest photoluminescence quantum yield of the Mn2+ emission achieves 36.7%, which is comparable with QDs prepared by the conventional hot-injection method. Depending on the ratios of PbPb2/PbCl2, the energy transfer rate from the band-edge to Mn2+ excited state is in the range of 0.006–20.42 × 107 s−1. Furthermore, white light-emitting diodes (LEDs) were successfully fabricated by combining the as-prepared Mn-doped CsPbX3 QDs with commercial UV GaN chips, and the high luminous efficiency of the as-prepared white LEDs was developed to 55.9 lm W−1. This work strongly supports the fact that Mn-doped CsPbX3 QDs are promising materials for application in lighting and displaying fields.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 160
·期 16
·
IF 3.1
Du Luchao,An Jie,Katayama Tetsuro,Duan Menghan,Shi XiaoPing,Wang Yunpeng,Furube Akihiro
In recent years, all-inorganic perovskite materials have become an ideal choice for new thin film solar cells due to their excellent photophysical properties and have become a research hotspot. Studying the ultrafast dynamics of photo-generated carriers is of great significance for further improving the performance of such devices. In this work, we focus on the transient dynamic process of CsPbBr 3 /TiO 2 composite systems with different Mn 2+ doping contents using femtosecond transient absorption spectroscopy technology. We used singular value decomposition and global fitting to analyze the transient absorption spectra and obtained three components, which are classified as hot carrier cooling, charge transfer, and charge recombination processes, respectively. We found that the doping concentration of Mn 2+ has an impact on all three processes. We think that the following two factors are responsible: one is the density of defect states and the other is the bandgap width of perovskite. As the concentration of doped Mn 2+ increases, the charge transfer time constant shows a trend of initially increasing, followed by a subsequent decrease, reaching a turning point. This indicates that an appropriate amount of Mn 2+ doping can effectively improve the photoelectric performance of solar cell systems. We proposed a possible charge transfer mechanism model and further elucidated the microscopic mechanism of the effect of Mn 2+ doping on the interface charge transfer process of the CsPbBr 3 /TiO 2 solar cell system.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Xinyue Gu,Chen Tan,Lixian He,Jie Guo,Xia Zhao,Kezhen Qi,Ya Yan
In this work, AgInS 2 and Mn 2+ doped AgInS 2 (Mn–AgInS 2 ) with different Mn 2+ : (Ag + + In 3+ ) ratios were synthesized via a low temperature liquid method. The photocatalytic activity of the obtained samples was followed by taking formaldehyde as the target pollutant under visible light irradiation. The photocatalysts were passed through various characterization procedures to investigate their morphological, structural and photophysical characteristics. The optimal proportion sample [with the ratio n (Mn 2+ ): n (Ag + + In 3+ ) = 1:100] photodegraded about 79% formaldehyde in 150 min. These upgraded activities are attributed to the enhanced visible light absorption and superior charge separation due to the presence of Mn 2+ as confirmed site from charge separation measurements. In addition, a possible mechanism for the photodegradation of formaldehyde is proposed based on the experimental results. Furthermore, the photocatalytic water splitting performance of Mn–AgInS 2 and multi-walled carbon nanotubes (MWCNTs) modified Mn–AgInS 2 is investigated and compared under simulated sunlight irradiation, and remarkable hydrogen production is achieved (105 μmol h −1 g −1 ) by using the latter.
研究领域:
材料科学
·
环境科学
·
光催化领域
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Xiaoli Li,Yonglei Feng,Liwei Wang,Xianke Sun
A few of Bi 3+ /Mn 2+ doped Ba 9 La 2 Si 6 O 24 phosphors were synthesized in air by the solid state reactions at 1400 °C for the purpose of investigating their possible uses in the light-emitting diodes. The phase and luminescence performance were surveyed using the X-ray diffractometer and spectrometer, respectively. The results demonstrate the single phase and absorbance to the ultraviolet light of the synthesized phosphors. There is the Bi 3+ → Mn 2+ energy transfer, which gives rise to the tunable luminescence of the Bi 3+ /Mn 2+ codoped Ba 9 La 2 Si 6 O 24 phosphors. Upon the ultraviolet light excitation, the white light is generated by the Ba 9 La 2 Si 6 O 24 :0.03Bi 3+ /0.02Mn 2+ and Ba 9 La 2 Si 6 O 24 :0.03Bi 3+ /0.03Mn 2+ phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 18
·6220-6226
·
IF 6.4
Dayu Huang,Ziyong Cheng,Qiuyun Ouyang,Hongzhou Lian,Jun Lin
The lattice defects that occur in material preparation processes are closely related to carrier migration. The carrier migration can be regulated by artificially modulating the defects to improve the luminescence performance, which is important for the development and application of luminescent materials. Here, we achieved a 3.29-fold increase in the high-temperature luminescence intensity by introducing Mn2+ to generate Cl vacancy defects in Cs2CdCl4. Due to thermally induced electron de-trapping, Cs2CdCl4:Mn2+ also displays anti-thermal quenching (ATQ) behavior and good thermal quenching resistance (329% at 175 °C). The increase in the photoionization effect and de-trapping of the captured electrons from shallow trap states were appropriately attributed to this exceptional phenomenon, based on thermoluminescence (TL) analysis. Based on comprehensive optical characterization, thermoluminescence and temperature-dependent X-ray diffraction (XRD), we reveal that the Cl vacancy trap state generated by Mn doping is the reason for the enhanced PL in air. The discovery of these materials helps to better understand the optical properties of all-inorganic perovskites.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2025
·Vol. 13
·期 14
·2403472
·
IF 7.2
Hongzhen Liu,Yuhe Shao,Chao Dou,Jing Zhao,Zhen Song,Quanlin Liu
Mechanoluminescence (ML) materials can convert mechanical energy into photoelectrons and have significant potential for applications in intelligent sensing, self-driven luminescent displays, and human-computer interaction. Among the numerous ML systems, Mn 2+ -doped wurtzite-based phosphors have become a prominent ML family. However, their ML emissions are typically confined to visible light, which substantially limits their utility in fields such as biomechanics and bioimaging. Here, it is demonstrated that the photoluminescence (PL) and ML emission of CaZnOS:Mn 2+ can be tuned from the red to near-infrared light (peaked at 770 nm) by regulating the Mn 2+ ion concentration. The electronic paramagnetic resonance, PL lifetime, and various spectra reveal that the near-infrared emission originates from the enhanced magnetic interaction of Mn 2+ pairs due to intrinsic defects. The heavy Mn 2+ -doped CaZnOS elastomer with near-infrared ML emission exhibits distinct advantages over low Mn 2+ -doped CaZnOS with only red emission in the field of biomechanical imaging. This work achieves near-infrared emission in CaZnOS phosphors singly doped with Mn 2+ ions for the first time, providing a perspective for spectra broadening of Mn 2+ ions-doped phosphors.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）